static struct x86_frame_cache *
amd64_sigtramp_frame_cache(struct frame_info *next_frame, void **this_cache)
{
struct x86_frame_cache *cache;
struct gdbarch_tdep *tdep = gdbarch_tdep(current_gdbarch);
CORE_ADDR addr;
gdb_byte buf[8];
int i;
if (*this_cache)
return (struct x86_frame_cache *)*this_cache;
cache = x86_alloc_frame_cache(8);
frame_unwind_register(next_frame, AMD64_RSP_REGNUM, buf);
cache->frame_base = extract_unsigned_integer(buf, 8);
addr = tdep->sigcontext_addr(next_frame);
gdb_assert(tdep->sc_reg_offset);
gdb_assert(tdep->sc_num_regs <= AMD64_NUM_SAVED_REGS);
for (i = 0; i < tdep->sc_num_regs; i++)
if (tdep->sc_reg_offset[i] != -1)
cache->saved_regs[i] = (addr + tdep->sc_reg_offset[i]);
cache->saved_regs_are_absolute = 1;
cache->prologue_scan_status = full_scan_succeeded;
cache->saved_regs_are_absolute = 1;
*this_cache = cache;
return cache;
}
static CORE_ADDR
i386syl_sigcontext_addr (struct frame_info *next_frame)
{
CORE_ADDR pc;
CORE_ADDR sp;
char buf[4];
frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 4);
pc = i386syl_sigtramp_start (next_frame);
if (pc)
{
/* The sigcontext structure lives on the stack, right after
the signum argument. We determine the address of the
sigcontext structure by looking at the frame's stack
pointer. Keep in mind that the first instruction of the
sigtramp code is "pop %eax". If the PC is after this
instruction, adjust the returned value accordingly. */
if (pc == frame_pc_unwind (next_frame))
return sp + 4;
return sp;
}
error ("Couldn't recognize signal trampoline.");
return 0;
}
static CORE_ADDR
i386bsd_sigcontext_addr (struct frame_info *next_frame)
{
char buf[4];
CORE_ADDR sp;
frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 4);
return read_memory_unsigned_integer (sp + 8, 4);
}
static CORE_ADDR
i386nto_sigcontext_addr (struct frame_info *next_frame)
{
char buf[4];
CORE_ADDR sp;
frame_unwind_register (next_frame, SP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 4);
return sp + I386_NTO_SIGCONTEXT_OFFSET;
}
static struct frame_id
amd64_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
gdb_byte buf[8];
CORE_ADDR fp;
frame_unwind_register (next_frame, AMD64_RBP_REGNUM, buf);
fp = extract_unsigned_integer (buf, 8);
return frame_id_build (fp + 16, frame_pc_unwind (next_frame));
}
static CORE_ADDR
read_reg (void *baton, int reg)
{
struct frame_info *next_frame = (struct frame_info *) baton;
struct gdbarch *gdbarch = get_frame_arch (next_frame);
int regnum;
char *buf;
regnum = DWARF2_REG_TO_REGNUM (reg);
buf = (char *) alloca (register_size (gdbarch, regnum));
frame_unwind_register (next_frame, regnum, buf);
return extract_typed_address (buf, builtin_type_void_data_ptr);
}
static CORE_ADDR
amd64_linux_sigcontext_addr (struct frame_info *next_frame)
{
CORE_ADDR sp;
gdb_byte buf[8];
frame_unwind_register (next_frame, SP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 8);
/* The sigcontext structure is part of the user context. A pointer
to the user context is passed as the third argument to the signal
handler, i.e. in %rdx. Unfortunately %rdx isn't preserved across
function calls so we can't use it. Fortunately the user context
is part of the signal frame and the unwound %rsp directly points
at it. */
return sp + AMD64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
}
static struct trad_frame_cache *
frv_linux_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct trad_frame_cache *cache;
struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (next_frame));
CORE_ADDR addr;
char buf[4];
int regnum;
CORE_ADDR sc_addr_cache_val = 0;
struct frame_id this_id;
if (*this_cache)
return *this_cache;
cache = trad_frame_cache_zalloc (next_frame);
/* FIXME: cagney/2004-05-01: This is is long standing broken code.
The frame ID's code address should be the start-address of the
signal trampoline and not the current PC within that
trampoline. */
frame_unwind_register (next_frame, sp_regnum, buf);
this_id = frame_id_build (extract_unsigned_integer (buf, sizeof buf),
frame_pc_unwind (next_frame));
trad_frame_set_id (cache, this_id);
for (regnum = 0; regnum < frv_num_regs; regnum++)
{
LONGEST reg_addr = frv_linux_sigcontext_reg_addr (next_frame, regnum,
&sc_addr_cache_val);
if (reg_addr != -1)
trad_frame_set_reg_addr (cache, regnum, reg_addr);
}
*this_cache = cache;
return cache;
}
static void
sparc32_frame_prev_register (struct frame_info *next_frame, void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, gdb_byte *valuep)
{
struct sparc_frame_cache *cache =
sparc32_frame_cache (next_frame, this_cache);
if (regnum == SPARC32_PC_REGNUM || regnum == SPARC32_NPC_REGNUM)
{
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
*realnump = -1;
if (valuep)
{
CORE_ADDR pc = (regnum == SPARC32_NPC_REGNUM) ? 4 : 0;
/* If this functions has a Structure, Union or
Quad-Precision return value, we have to skip the UNIMP
instruction that encodes the size of the structure. */
if (cache->struct_return_p)
pc += 4;
regnum = cache->frameless_p ? SPARC_O7_REGNUM : SPARC_I7_REGNUM;
pc += frame_unwind_register_unsigned (next_frame, regnum) + 8;
store_unsigned_integer (valuep, 4, pc);
}
return;
}
/* Handle StackGhost. */
{
ULONGEST wcookie = sparc_fetch_wcookie ();
if (wcookie != 0 && !cache->frameless_p && regnum == SPARC_I7_REGNUM)
{
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
*realnump = -1;
if (valuep)
{
CORE_ADDR addr = cache->base + (regnum - SPARC_L0_REGNUM) * 4;
ULONGEST i7;
/* Read the value in from memory. */
i7 = get_frame_memory_unsigned (next_frame, addr, 4);
store_unsigned_integer (valuep, 4, i7 ^ wcookie);
}
return;
}
}
/* The previous frame's `local' and `in' registers have been saved
in the register save area. */
if (!cache->frameless_p
&& regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM)
{
*optimizedp = 0;
*lvalp = lval_memory;
*addrp = cache->base + (regnum - SPARC_L0_REGNUM) * 4;
*realnump = -1;
if (valuep)
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
/* Read the value in from memory. */
read_memory (*addrp, valuep, register_size (gdbarch, regnum));
}
return;
}
/* The previous frame's `out' registers are accessable as the
current frame's `in' registers. */
if (!cache->frameless_p
&& regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
regnum += (SPARC_I0_REGNUM - SPARC_O0_REGNUM);
*optimizedp = 0;
*lvalp = lval_register;
*addrp = 0;
*realnump = regnum;
if (valuep)
frame_unwind_register (next_frame, (*realnump), valuep);
}
static LONGEST
frv_linux_sigcontext_reg_addr (struct frame_info *next_frame, int regno,
CORE_ADDR *sc_addr_cache_ptr)
{
CORE_ADDR sc_addr;
if (sc_addr_cache_ptr && *sc_addr_cache_ptr)
{
sc_addr = *sc_addr_cache_ptr;
}
else
{
CORE_ADDR pc, sp;
char buf[4];
int tramp_type;
pc = frame_pc_unwind (next_frame);
tramp_type = frv_linux_pc_in_sigtramp (pc, 0);
frame_unwind_register (next_frame, sp_regnum, buf);
sp = extract_unsigned_integer (buf, sizeof buf);
if (tramp_type == NORMAL_SIGTRAMP)
{
/* For a normal sigtramp frame, the sigcontext struct starts
at SP + 8. */
sc_addr = sp + 8;
}
else if (tramp_type == RT_SIGTRAMP)
{
/* For a realtime sigtramp frame, SP + 12 contains a pointer
to a ucontext struct. The ucontext struct contains a
sigcontext struct starting 24 bytes in. (The offset of
uc_mcontext within struct ucontext is derived as follows:
stack_t is a 12-byte struct and struct sigcontext is
8-byte aligned. This gives an offset of 8 + 12 + 4 (for
padding) = 24.) */
if (target_read_memory (sp + 12, buf, sizeof buf) != 0)
{
warning (_("Can't read realtime sigtramp frame."));
return 0;
}
sc_addr = extract_unsigned_integer (buf, sizeof buf);
sc_addr += 24;
}
else
internal_error (__FILE__, __LINE__, _("not a signal trampoline"));
if (sc_addr_cache_ptr)
*sc_addr_cache_ptr = sc_addr;
}
switch (regno)
{
case psr_regnum :
return sc_addr + 0;
/* sc_addr + 4 has "isr", the Integer Status Register. */
case ccr_regnum :
return sc_addr + 8;
case cccr_regnum :
return sc_addr + 12;
case lr_regnum :
return sc_addr + 16;
case lcr_regnum :
return sc_addr + 20;
case pc_regnum :
return sc_addr + 24;
/* sc_addr + 28 is __status, the exception status.
sc_addr + 32 is syscallno, the syscall number or -1.
sc_addr + 36 is orig_gr8, the original syscall arg #1.
sc_addr + 40 is gner[0].
sc_addr + 44 is gner[1]. */
case iacc0h_regnum :
return sc_addr + 48;
case iacc0l_regnum :
return sc_addr + 52;
default :
if (first_gpr_regnum <= regno && regno <= last_gpr_regnum)
return sc_addr + 56 + 4 * (regno - first_gpr_regnum);
else if (first_fpr_regnum <= regno && regno <= last_fpr_regnum)
return sc_addr + 312 + 4 * (regno - first_fpr_regnum);
else
return -1; /* not saved. */
}
}